Type-writing machine.



0-. GIBBS & J. sokoLov;

' TYPE WRITING MACHINE.

APPLICATION FILED JULY 15, 1993.

Patented Dec. 20, 1910.

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CHARLES GIBBS AND JACOB SOKOLOV, OIE NEW YORK, N. Y., ASSIGNORS TO UNDER- WOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

Application filed July county of Kings, andb'tate of New York,

.spring for each of the rock arms.

' platen.

is put into use, occasional read ustment of have invented certain new and useful linproveinents in 'lypow'riting iv'lachines, of which the following is a specification.

This invention relates to paper-feeding rolls of typewriting machines, and its object is to improve the means for putting the desired tension upon the rolls.

In some type of machines, especially the Underwood type, forward and rear rolls are arranged to run upon the underside of a cylindrical platen, for feeding the paper forwardly around the under side of the platenand upwardly to the printing point. Usually the forward rolls are carried upon a shaft which ishiing in rock-arms, and the rear rolls are similarly mounted in other It is usual to provide a separate The springs are fixed upon collars which are secured upon a common fixed rod, provision being made for adjusting the tension of each of the springs separately, to get the required pressure of the rolls against the It. isfound that when the machine rock-a rins.

the tension of the springs is found desirable. In order to effect this adjustment conveniently, it 1S necessary to remove the platen frame from the typewriting machine,

to give the mechanic access to the screws which are used for adjusting the springs.

The principal object of the present improvements is to simplify the construction and operation of the tension-adjusting means, particularly with a view to rendering it possible'to adjust the tension of the rolls at either endof the platen quickly and accurately, and without neccssit of removing the platen and frame, or ot ier-wise dismantling any part of the typewriting machine.

In'carrying out the present improvements a single spring structure is employed at each end of the platen to bear upon both front and rear'roll axles. This spring structure omprises two spring arms which arehung or pivotally supported upon a shaft, the

TYPE-WRITING MACHINE.

Specification of Letters Patent. Patented Dec, 20 1910. 15, 1908.

Serial N 0. 443.581;

Each of the spring shafts may be to "increase of diminish the tension of its spring arms or springs. Each of said shafts extends longitudinally of the platen, and is provided at its ends with eccentric bosses to serve as journals for the shaft, whereby it is hung in brackets suitably supported upon the platen frame. By simply turning either of these spring shafts, it may be brought nearer to the platen, and hence caused to press its spring arms more firmly against the roll axles. Each of these shafts is provided at its outer end with a nick or other device, to fit a screw driver or "wrench, which may be inserted horizontally, at either end of the platen frame, to engage and turn the shaft, without the necessity of removing the platen frame from the machine. Thus when the mechanic finds that the sheet'is held too firmly on one side, he may instantly reduce the pressure of all therolls at the corresponding end of the platen by simply introducing and turning a screwdriver; and the same method may be employed to increase the pressure .ateither end of the platen.

In the accompanying drawings, Figure 1' is a front elevation of the platen, platen frame and pressure roll devices of an Underwood front strike writing machine, showing therolls in normal positions; the rollv tension being strong at the left hand end of the platen and weak at the right hand end thereof. Fig. 2 isa cross-section to" show the pressure of the rolls diminished as but showing the spring-pressure at the maximum, as at the left hand end of Fig. 1. Fig. 6 IS a view similar to Fig. :3, but showing the pressure rolls released, and also showing the spring regulator a tfifle'more regulated than at Fig. 3. Fig. 7 is a perspective view of the pressure roll devices at one elevation of one of the hangers that carry tioned between the roll axles 6 and 10. It

spring end of the platen frame. Fig. 8 is an end the spring-regulating shafts.

Acylindrical platen 1 is mounted by an l axle 2 in a platen frame comprising ends 3 I and a horizontal. bolt or stay-rod 4. Front rolls 5 are mounted upon an axle 6 carried in a pair of rock-anus 7, 8, which are pivoted upon the rod ftand extend forwardly therefrom to said axle. ,g-Bear rolls, 9 are I carried upon an axle 10 which is hung upon l arms 11 pivoted upon said rod 4. Springs i 12 and 13 bear upon the axles 6 and 10 at j the left hand end of the platen, and springs 14 and 15 perform a similar function at the i on steps 31 formed on hangers right hand end of the platen.

Itwill be seen at Fig. 7 that the springs 14 and 15 may be formed in one piece, with a U-shape socket 16 at their junction, to fit loosely or pivot upon a'supporting shaft 17. i Of course the springs may be otherwise formed, supported and connected, but the form illustrated embodies one convenient means for pivotally balancing the springs upon the supporting shaft 17, so that the pressure may be equally or suitably apporwill be seen that a singlepiece of metal is folded and curved to form the pivot or socket portion 16; but this form of pivoting or supporting is not insisted upon. The springs 1a and 15 flare outwardly at their upper ends sufiiciently to produce an upward pressure against the axles, to cause the "oils to bear properly against the platen. if on the ends of the supporting shaft 17 are fbrmed or provided collars or bosses 18, 1t) concentric with each other but eccentric to the shaft, and serving as journals therefor, said journals resting on suitable steps or bearings 20, 21 formed in the lower parts of hangers 22, 23 secured by screws 24 upon the fixed rod 4 of the platen frame. Because of the eccentricity of these journals, it follows that when the shaft 17'is rotated, it rises and falls bodily, thereby either forcing the s rings 14, 15 with greater pressure against the roll axle or relieving such pres sure; and it is manifest that the shaft may beset to any oint between its extreme up and down positions, thereby regulating the I spring pressure to a nicety upon both roll axles at one end. of the )laten. The ends of the spring-supporting s aft 17 are fitted in and extended throu h vertical slots 25 in the hangers to guide t e shaft as it rises and falls; and it will be understood that the bearings 2O and 21 are in the form of flat or horizontal steps, so that the eccentric bosses 18, 19am at liberty to move from side l to side, while the shaft 17 moves straight 1 up or down. The outer end of the shaft 17 is provided with a nick 26 to receive the l pomtof a screw driver 27, whlch it Will be neath the platen frame to engage said nick, without disturbing the mounting of the platen frame in the machine, which is a great convenience. It will be seen that the springs 14, 15 are preferably mounted on the shaft 17 between its bearings 18, 19, and the latter preferably confined between the hangers 22-, 23, and serving as bufi'er collars t? )revcnt endwi e displacement of the s m t. q

The springs 12, 13 are mounted and adjusted in the manner already described in respect to springs 14 and 15; being pivotally supported by a socket 28 upon a shaft 29 having eccentric bearing bosses 30 resting 32 secured upon the rod 1, the outer-end of the shaft 29 formed with a nick for a screw driver, or otherwise formed to be operated by a suitable key. It will be seen that the two sets of spring devices may depend from the platen frame one at each side of the usual roll 34, which runs upon the usual shift rail 35,said roll 34 mounted on the lower end of a dependent bracket 36, whic is fixed upon the rod Thus it will be seen that the spring shaijt hangers occupy practically no extra room in the machine, since during the travel of the carriage they move along the path followetl by the roll 34 and hanger 36.

It will be seen that either end of the double set of rolls maybe caused to grip the paper either more or less firml' by means of a simple twist of a screw driver, so that much economy and time is etfected in making the original adjustment as well as readjustment from time to time; while the operation may be readily performed by an unskilled person.

Any suitable release key 37 ma be provided for the pressure rolls, the lZey being shown connected by a link 38 and a crank 39 on a rock-shaft 10 having cams 41 to en age arms 42 formed'on the arms 7, 55, which carry the roll axles.

So far as the pressure-regulating devices are concerned it is not essential in all cases that springs '14 and 15 be fixed or connected. to each other, or that means be employed to divide the pressure of one spring device between two rolls or roll axles; since many variations may be resorted to within the scope of the invention. Portions of the improvelnents'may be used without others.

Having thus described our invention, we claim: 7

1. In a typewriting machine, the combination of paper feed rollers nrounted upon a shaft, a spring for regulating the tension of the feed roller on the paper, and an eccentric cam for adjusting the tension'of said spring.

2. In a typewriting machine, the combination of paper feed rollers mounted upon a shaft, a spring mounted near each end of ioted may be readily thrust horizontally bel said shaft and bearing against the same for 136 ,said springs for regulating the tension thereof. l

3. In a typewriting machine, the combination of a plurality of paper feed roller shafts having feed rollers mounted thereon,

springs bearing against each end of said' shafts, and a plurality of eccentric cams connected by a shaft for each of said springs which are adapted to be adjusted by a toolinserted from the end of the platen frame.

4. In a typewriting machine, the combination of a plurality of paper-feed roller-- shafts, a spring pressing against each of said shafts near the ends thereof, a shaft for sustaining and actuating each of said springs, and a cam on each side of each of said springs for regulating the position of the spring carrying shaft for varylng the tension of the spring upon the paper-feed roller' shafts. 5. In a typewritlng machine, the (nimblnation of a plurality of paper feed roller carrying shafts, a spring positioned near each end of sald shafts for regulating the tensionof the paper-feed rollers upon the paper, each of said springs being bent upon itself centrally for forming a seat for receiving a camshaft, a cam shaft for each of said springs, an eccentric cam for each of spring en agin eaclnend t ereo and formed with a seat formounted shaft positioned in the seat on each said shafts for regulating the position of said shafts, and the tension of the spring upon said paper roller shafts.

6. In a typewriting' machine, the combi-- nation of a paper feed roller mounted'upon a shaft-,a spring positioned near each end,

of said shaft and bearing against the-same for regulating the tension of the paper feed. roller carried thereby, and an independent eccentrically-mounted shaft for each of said.

springs and so arranged as to be adjusted by an instrument inserted at the end ofjthe platen frame.

7 In a typewritingmachine, the combination of'a plurality of paper feed roller shafts provided with paper feed rollers, a each of said shafts near holding thespring in place, an eccentrically of said springs and arranged in axial alinement, whereby each shaft may be adjust-able "independently by a tool inserted from each end of the platen frame for'var ing the tension of the springs upon said paper feed roller shafts. v

8. In a typewriting machine, the combination of.-a paper-feed roller shaft, a plurality of springs for each shaft, and an independently operated-eccentrically mounted shaft for each of said springs arranged in'.

. axial alineme'nt and formed witha-tool-r'e;

n w at wh e y 1 9 yb eefled W ac l fth nastin ss:

adjusting independently the position of said cccentrically mounted shafts and the-tension of each of said springs;

9. In a typewriting' machine, the combination of a plurality of paper-feed rollershafts. a spring mounted near the ends of said shafts, each of said springsbearing against both paper feed roller shafts, an eccentrically mounted shaft for each of said springs for regulating the tension thereof, and supports for said eccentrically mounted shafts formed with seats which co-act with said shafts for permitting said shafts-to rotate eccentricaily and vary the tension of said spring;

10. In a typewriting machine, the combination of paper-feed roller shafts, springs mounted near each end of said shafts, each spring bearing against both the roll shafts, and an eccentrically mounted shaft engaging the central portion of each of said springs and formed with a tool-receiving notch in the end, whereby a tool may be inserted from the end of the platen. frame for adjusting the position of said eccentric shaft and the tBHSIOD Of said springs.

'11. In a-typewriting machine, the combination of a plurality" of paper feed roller shafts, springs for pressing against said shafts, eccentric cams for regulating the tension of said springs, rotatable shafts upon which said cams are mounted, and supports formed with seats for said cams and with nation of a plurality of paper-feed roller shafts, springs pressing against said shafts near the ends thereof, a plurality of eccentrically mo nited cams for each of said springs, connected by a shaft that rojects beyond said cams, and supports or.said cams formed with a slot for receiving the projecting ends of said cam shafts and for guiding said cams. I

13. In a typewriting machine, the combination of a plurality of paper-feed roller shafts, springs pressing against said shafts near the ends thereof, a plurality of eccent-ricallymounted cams for each of said springs connected by a shaft. that projects beyond said cams, andsupportsfor said cams formed with a slot for receiving the projecting ends of said cam shafts'and for guiding said cams, said cam su ports, hold mg said cams and'said cam sha ts in a position which will permit the use of a tool inserted vfrom the end of the platen frame for adjusting the position of said cams and the tension of said springs.

14. Ina 'typewriting machine having a platen revolub Y mounted in a platen frame, the combination with front and rear rolls having axles, of a single spring structure at each fiind Ofthe platen to bear upon both I front- .lfear roll axles, each springstructure comprising two spring arms pivotally supporte upon a shaft, the arms diverging from the shaft and at their free ends bearing upon the roll devices, each of the spring shafts adjustable independently of the other to vary the tension of its spring arms.

15. In a typewriting machine having a platen revolubly mounted in a platen frame, Y

the combination with front and rear rolls having axles, of a single spring structure at each end of the platen to bear upon both front and rear roll axles, each spring structure comprising two spring arms pivotally supported upon a shaft, the arms diverging from the shaft and at their free ends bearing upon the roll devices, each of the spring shafts adjustable independently of the other to vary the tension of its spring arms, each of said shafts extending longitudinally of the platen, and provided at its ends with eccentric bosses to serve as journals for the shafts whereby it is mounted upon suitable supports.

116, In a typewriting machine having" a platen revolubly mounted'in a platen frame, the combination with front and rear rolls having axles, of a single spring structure at each end of the platen to bear upon both front and rear roll axles, each spring structure comprising two spring armspivotally supported upon a shaft, the-arz'nsdiverging from the shaft and at their free ends bear .ing upon the roll devices, each of the spring shafts adjustable independently of the other to vary the tension of its spring arms, each of said shafts extending longitudinally of the platen, and provided at its ends with eccentric bosses to serve as journals for the shafts whereby it is mounted upon suitable supports, each shaft provided at its outer end with a nick or device to fit a screw driver or tool.

17. In a typewriting machine having a platen revolubly mounted in a platen frame, the combination with a pressure roll axle extending along the platen, of springs at the ends of the platen formpressing the axle or roll against the platen, and independent spring-adjusting shafts at the ends of the platen, each shaft eecentrically journaled on the platen frame and provided with a nick or device, whereby it is turned by a tool, to regulate the tension of its spring.

18. In a typewriting machine having a platen revoluhly mounted in a platen frame, the combination with a plurality of axles extending alongthe platen and carrying pressure rolls, of springs at the ends of the platen for pressing the axles or rolls against the platen, and sha fts one at each end of the platen, each shaft. capable of adjusting the springs at its end of the platen, each shaft: eccentrieally journaled on the platen frame and provided with a nick or device wherel'iy it is turned by a tool to regulate the tensionof its springs.

CHARLES GEBBS. JACOB SOKGLUV.

VVitn esses JOHN O. Scrrmrr, K. Flmivitium'r. 

